Although we call them smart devices, their true differential factor in general is connectivity, so that we can control and monitor them remotely from mobile, tablet or smart speaker.
How do they connect? The most common connectivity standards are Bluetooth, Wi-Fi and ZigBee or Z-Wave protocols, the latter two require a hub or gateway as an intermediary between the home router and control devices.
There is no better or worse option, but each one has its advantages and disadvantages, varying its suitability depending on the use we will give it. If the idea is to have few devices connected, Wi-Fi is a simple option and does not require more elements for its operation.
But if on the contrary we seek to domotize our house by replacing light bulbs, plugs, automating blinds, connecting the TV ... in this case it is worth betting on a system that integrates a bridge to link everything and from there, establish the connection with the router. By reducing the number of devices connected to the router, the possibility of interference is less.
We recommend that you do not marry any brand, sometimes they close your system to your products, ceasing to be standard, then having to buy your brand, so we recommend open and standardized systems. Z-wave is an example of them, you can find different brands compatible with this protocol. You only need a z-wave plus gateway and you can now install hundreds of compatible devices with this system.